Circuit-Zone.com - Electronic Projects

Class A Amplifier 8W
Posted on Monday, May 16, 2011   •   Category: Amplifiers

Class A Amplifier 8W

This is 8W Class A Amplifier I recently built. I am very pleased with the sonic results of this amplifier. It really does not disappoint. Even using fairly standard 3 way speakers in a large room, surprisingly there is ample power. What strikes me the most is the ability of this amplifier to differentiate between instruments and noises in the sound stage. This clarity is what I like most and I think this is achieved by deceptively simple and pure circuit topology. I used the original board layout, transistors and JFETs, and made some modifications. Heat sinking was increased to approximately triple the amount recommended. Instead of using the standard bridge rectifier, capacitor bank and battery setup, I opted for a fully regulated supply with a total of 127,0000 uF capacitance per channel and a 500 VA toroid transformer.

Automatic Battery Charger
Posted on Sunday, May 15, 2011   •   Category: Battery Chargers

Automatic Battery Charger

Here is a simple battery charger circuit intended for 12 Volt gell-type battery. Current is limited by the 7805 regulator IC and the limiting resistor (62 ohms) to approximately 250 milliamperes, anyway most small sized gell-type battery capacities ranges from 2.5AH to 7.5AH so charging time should take several hours. When the battery is full, the regulator adjust its voltage output from 15 volts down to 5 volts automatically terminate the charging process.

Solar Battery Charger with LM317
Posted on Saturday, May 14, 2011   •   Category: Battery Chargers

Solar Battery Charger with LM317

This is a solar panel battery charger schematic for AA and AAA rechargeable batteries. A small solar panel would be very good as a source of voltage charger. Building a solar AA battery charger only requires a few components and a simple construction. Solar panels should be well adapted to the battery to be charged or the battery may be overcharged. If you want to charge batteries with different capacities, then you need to change the solar panels. Since this is a simple solar battery charger that does not automatically turn off when the battery is full. So we need to maintain the charging current is low enough that will not damage the battery even when they are fully charged. An LM317T voltage regulator chip that can be used with a suitable resistor to regulate current. See solar AA battery charger

Light / Dark Relay Switch
Posted on Friday, May 13, 2011   •   Category: Sensors

Light / Dark Relay Switch

A simple light / dark activated relay switch circuit, suitable for many applications like the automatic switching of the lights in a shop window or a room according to the ambient light level. The circuit uses a light dependent resistor (LDR). A light/dark option has been incorporated. The term 'light/dark' is used because the circuit has a PCB-mounted switch on board. In one switch position a light-to-dark transition will activate the relay. In the other position a dark-to-light transition is required. So you can use the falling light on the detector to switch on a normally off circuit or switch off a normally on circuit. The relay is on when LDR uncovered and relay off when LDR covered. Adjust VR1 for light sensitivity. LED will turn on at the same time with relay.

DTMF Decoder Using MT8870
Posted on Thursday, May 12, 2011   •   Category: Phone Circuits

DTMF Decoder Using MT8870

This circuit detects the dial tone from a telephone line and decodes the keypad pressed on the remote telephone. The dial tone we heard when we pick up the phone set is call Dual Tone Multi-Frequency, DTMF in short. The name was given because the tone that we heard over the phone is actually make up of two distinct frequency tone, hence the name dual tone. The DTMF tone is a form of one way communication between the dialer and the telephone exchange. A complete communication consist of the tone generator and the tone decoder. In this article, we are use the IC MT8870DE, the main component to decode the input dial tone to 5 digital output. These digital bits can be interface to a computer or microcontroller for further application eg. remote control, phone line transfer operation, LEDs, etc...

Transformerless Power Supply
Posted on Thursday, May 12, 2011   •   Category: Power Supplies

Transformerless Power Supply

Simple, low cost and easy to build power supply. Ideal for applications that doesn’t require too much power. It can provide power to circuit that uses less than 100mA without any problem. The disadvantage of this circuit is the danger of an electrical shock, so it cannot be used if the circuit is in contact with the user. The voltage supplied by this is determined by the zener diode.

HI-FI Valve Amplifier
Posted on Wednesday, May 11, 2011   •   Category: Amplifiers

HI-FI Valve Amplifier

I wanted to make this HI-FI Valve Amplifier so that MCS can be considered a classic brand like a lot, but my hand veteran tuner anfimden kopamıyordum transistor amplifier at the end of this one day I decided to take it in my hand as long as I have somehow amplifier kurtulamayacaktım air after breakfast and drinking my tea I gave trying to check if the decision is correct Cry with her ​​almost 15 years we have not shared this with less than animism, but cherish her ​​love of rock music by pressing the send us compelled to take this tube amplifier device bitirebilecektim yes, I was sure before I took a friend who wants to 3 months without music ... without it stood late Tagged with kamçılandım ITSELF HERE:)

Arduino AVR In System Programmer
Posted on Tuesday, May 10, 2011   •   Category: Arduino

Arduino AVR In System Programmer

Randall converted an Arduino into AVR chip programming hardware for use with AVRDude. The project programs AVR tiny13 and other tiny AVR chips using an Arduino. He provides code and instructions to implement the Atmel AVR910 In System Programming protocol. I ported the Atmel AVR910 In System Programmer protocol to the Arduino. Now I can write programs to my ATtiny2313 and tiny13 chips. The Arduino sketch is available for download here. It works with the AVRDude programming software. This article will show how to use the Arduino to upload a program to the tiny13. The first step is to download the zip, extract the .pde file, then load it into the Arduino IDE, and write it to the Arduino. Next we can hook up the tiny13 chip.

PIC based Spectrum Analyser for PC
Posted on Tuesday, May 10, 2011   •   Category: Test and Measurement

PIC based Spectrum Analyser for PC

This is PIC18F2550 based Spectrum analyzer mod for PC. It uses WG24064A 240x64 graphical LCD with T6963 controller to display the result.

AVR ISP Programmer (In-Sytem programmer) for ATMEL
Posted on Tuesday, May 10, 2011   •   Category: AVR

AVR ISP Programmer (In-Sytem programmer) for ATMEL

This AVR ISP original by ATMEL you can found on "AVR software and technical Library - April 2003" CD-rom. It small component count I design new PCB and change some component that easy to build small PCB. The new firmware was writen by John Samperi for AT90S2313. This code can program more devices.

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